The LTC2378-18 is a low noise, low power, high speed 18-bit successive approximation register (SAR) ADC. Operating from a 2.5V supply, the LTC2378-18 has a ±VREF fully differential input range with VREF ranging from 2.5V to 5.1V. The LTC2378-18 consumes only 13.5mW and achieves ±1.75LSB INL maximum, no missing codes at 18 bits with 102dB SNR. The LTC2378-18 has a high speed SPI-compatible serial interface that supports 1.8V, 2.5V, 3.3V and 5V logic while also featuring a daisy-chain mode. The fast 1Msps throughput with no cycle latency makes the LTC2378-18 ideally suited for a wide variety of high speed applications. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2378-18 automatically powers down between conversions, leading to reduced power dissipation that scales with the sampling rate. The LTC2378-18 features a unique digital gain compression (DGC) function, which eliminates the driver amplifier’s negative supply while preserving the full resolution of the ADC. When enabled, the ADC performs a digital scaling function that maps zero-scale code from 0V to 0.1 • VREF and full-scale code from VREF to 0.9 • VREF. For a typical reference voltage of 5V, the full-scale input range is now 0.5V to 4.5V, which provides adequate headroom for powering the driving amplifier from a single 5.5V supply. Applications * Medical Imaging * High Speed Data Acquisition * Portable or Compact Instrumentation * Industrial Process Control * Low Power Battery-Operated Instrumentation * ATE * 1Msps Throughput Rate* ±1.75LSB INL (Max)* Guaranteed 18-Bit No Missing Codes* Low Power: 13.5mW at 1Msps, 13.5μW at 1ksps* 102dB SNR (typ) at fIN = 2kHz* –124dB THD (typ) at fIN = 2kHz* Digital Gain Compression (DGC)* Guaranteed Operation to 125°C* 2.5V Supply* Fully Differential Input Range ±VREF* VREF Input Range from 2.5V to 5.1V* No Pipeline Delay, No Cycle Latency* 1.8V to 5V I/O Voltages* SPI-Compatible Serial I/O with Daisy-Chain Mode* Internal Conversion Clock* 16-Lead MSOP and 4mm × 3mm DFN Packages https://elecena.pl/product/1777136/18-bit-1msps-low-power-sar-adc-with-102db-snr 2011-07-29 https://elecena.pl/product/1777136/18-bit-1msps-low-power-sar-adc-with-102db-snr 2013-11-26 https://elecena.pl/product/1777136/18-bit-1msps-low-power-sar-adc-with-102db-snr 2025-01-20